[bhav]

i need to plan 2 experimental methods to determine the formula of a hydrated sodium carbonate. My first method involves heating crystals of hydrated sodium carbonate but I'm stuck on how to find out the formula using titration.

i would really appreciate the help.

[Alberto_Kravina]

You could titrate your sample assuming that it is Na₂CO_3sicc..
After having performed the titration you can easily calculate the mass of pure Na₂CO₃

w(Na₂CO₃) = m(Sodium carbonate)/m(mixture that you assumed it was Na₂CO_3sicc.) * 100

This could be a method to find the percentage of water in your sample of sodium carbonate.